Ahistorian would like to analyze american history using the historical thinking skill of periodization. which of the following actions should he take?

a. use a variety of primary sources to create a secondary source
b. divide american history into eras with distinct characteristics
c. create an interesting narrative that tells the story of american history
d. evaluate his sources to make sure none have anti-american bias

B. Divide American history into eras with distinct characteristics.

Explanation:

this is a very simple, easy and yet a very effective way to periodate

American history we see it on certain channels that may feature History on it.

I hope this helped you!  

eleanor roosevelt

his husband tremodulny   by adding propserity and being serious about thingds aswell such as with the new deal one of the best first ladies out there was eleanor

the speech revealed that eastern european countries were no threat to their neighbors, which led to the creation of the truman doctrine i think this might be correct.